Final answer:
The term 'nymph' is not unique to termites but applies to the immature form of any insect that undergoes incomplete metamorphosis, which is observed in several insects including termites, mayflies, and dragonflies among others.
Step-by-step explanation:
The term "nymph" used for WDO, which stands for Wood-Destroying Organisms, is not unique to termites. In fact, a nymph is a developmental stage of many types of insects, not solely termites.
This term refers to the immature form of an insect that undergoes incomplete metamorphosis, meaning they gradually look more like an adult as they grow. Termites, mayflies, dragonflies and damselflies, as well as various other insect groups such as grasshoppers and crickets, are examples of insects where the term 'nymph' is applied to their developmental stages.